How Expensive Is Each Claude Model? (2026 Pricing Comparison)

How much does each Claude model cost in 2026? A full Anthropic API pricing comparison of Haiku 4.5, Sonnet 5, Opus 5, Fable 5.1 and Mythos 5.1 — including caching, Batch, fast mode and real cost per 1,000 requests.

Anthropic's general-access Claude API range currently has four main tiers: Model Input per 1M tokens Output per 1M tokens Claude Haiku 4.5 $1 $5 Claude Sonnet 5 $2 $10 Claude Opus 5 $5 $25 Claude Fable 5 $10 $50 Claude Sonnet 5's $2 input and $10 output pricing was originally introductory.

Anthropic made it permanent on 10 August 2026, so the previously announced increase to $3 and $15 no longer applies.

Claude Mythos 5 has the same pricing and technical specifications as Fable 5, but access is limited to approved Project Glasswing customers rather than being available through normal self-service access.

The difference between the cheapest active model and the most expensive generally available model is substantial.

Fable 5 costs ten times more than Haiku 4.5 for both input and output tokens.

Price per token, however, only tells part of the story.

Claude can consume additional output tokens while reasoning, newer models use a tokenizer that produces more tokens for the same amount of text, and agentic workflows can repeatedly send conversation history and tool results back into the model.

If you want capability rather than cost, see our best Claude model guide , the GPT-5.6 vs Claude Fable 5 deep dive , or the equivalent OpenAI pricing comparison .

How Claude API pricing works Claude API usage is primarily billed through input and output tokens.

Input tokens include instructions, conversation history, documents, images, tool definitions and tool results sent to the model.

Output tokens include Claude's visible answer, tool calls and the tokens consumed during internal reasoning.

Claude's thinking tokens are charged at the model's output-token rate, including thinking tokens that are not displayed to the user.